The absence of pullorum-infected wild birds during the sublines in place of reddish-legged girls and boys may be worth bringing-up

November 13, 2022 qualitasgepl 0 Comments

The absence of pullorum-infected wild birds during the sublines in place of reddish-legged girls and boys may be worth bringing-up

Probably, the male moms and dads ones specimens were homozygous towards the gene W. In several sublines from 20, where male parents was heterozygous (Ww), hens having pullorum situation was in fact recognized. Alternatives from the society has been achieved contrary to the recessive gene w (red-colored skin).

The brand new Prohibited-and-Speckled Leghorn was an enthusiastic egg-installing reproduce however it is a little too heavier. The new live weight away from 150-day-dated pullets try step 1.74 and this off adult hens try 2.0-2.1 kg. The new live lbs from cocks are 2.5 kilogram. Age of readiness is 165 months. Yearly design was 220 eggs averaging 58 g. Champ levels offer 270-290 egg per year. Egg shell is actually ointment or light; choice is happening to own ointment along with. Fertility off egg is actually 90-95% and you may hatchability 80%. Emergency rates of your more youthful around 150 times of age is 95%; during the adults it is 87%.

The characteristic feature of the new population is an excellent carcass appearance. In this trait they are superior to all known breeds of coloured chickens which carry the dominant gene E. Barred-and-Speckled hens, when mated with cocks of the C1C2 male parental form from the cross Hysex white, produce three-line hybrid layers, which are as good as four-way hybrids.

Barred-and-Speckled Leghorns was bred to have improved eggs production and for combining feature regarding mix which have men parental traces of White Leghorns.

Black colored SPECKLED AUSTRALORP (Cherno-pestraya avstralorp)

An experimental population was created at the All-Union Research Institute of Farm Animal Breeding and Genetics by breeding inter se descendants of Black Australorps which had been injected intramuscularly with blood from Barred Plymouth Rocks. The total volume of Niche dating app components injected during 11 months amounted to 330-380 ml per bird. The 1962 experiment resulted in 1093 offspring (F1). Among them were birds in which the juvenile moult produced, instead of black, a partially or completely white plumage. The number of chickens (F1) with depigmentation in groups which received injections of the whole alien blood, plasma, and blood elements was 4 (2.2%), 2 (1.9%) and 1 (0.9%). The control group had no specimens with white plumage.

Mendelian study revealed that the fresh new light color of the plumage from inside the birds gotten inside try out try determined by the result out of this new semi-prominent gene De which have 40% penetrance during the heterozygotes (Dede). The definition of away from depigmentation ranged significantly in individual chickens.

Experimental chickens and shown a sizeable variation regarding down the colour of your own embryo. And black, that is normal to possess Australorps, nearly light is observed, with lots of transitions between them. Assuming that this will be a good recessive reputation, brand new mating away from heterozygotes is to render 25% from times. The brand new departure of one’s observed count (7) in the officially questioned (8-9) appeared to be maybe not statistically significant.

Wild birds having white embryo off had been bred inter se and you may crossed having chickens which have most other down the colour. Inside the 1973-74, over 5000 such as for instance chicks was in fact hatched. The decisive plumage was black which have a little depigmentation. It was verified one to light color of new embryo off is inherited because a good recessive reputation in relation to black hence it is controlled by the newest autosomal gene sp (spot). Brand new gene sp suppresses melanin synthesis within the homozygotes not just in certain years of your plumage, and from the shanks. That it advances significantly the look of Black colored Speckled Australorp carcasses (dede spsp), versus unique reproduce – Black colored Australorps (dede SpSp).

A couple F5 females birds produced 33 chicks eight (21%) from which was in fact white having a tiny black-spot toward straight back

After that reproduction is presented using this type of classification and elevating out-of birds carrying the brand new De- allele was abandoned. Birds with white decisive plumage (DeDe SpSp) had eyesight faults with signs and symptoms of exophthalmos and you may anexophthalmos.

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